516 APPENDIX. 



in the right one, for instance in TV. serpuloides. The same 

 inequalities exist in the neck-lappets of the larger Trochi. I 

 have thus removed all aberrations between the organs of the 

 larger and these minute but perfect Trochidans. I believe 

 there are only three vibracula on each side the opercular lobe, 

 instead of four as I have elsewhere stated, but I do not vouch 

 that there may not be four in one of the above species. 



PHASIANELLA PULLUS. (P. 320.) 



Exmouth, July 1854. 



As I have several important additions and corrections to 

 make in my account of this animal, I have thought it best to 

 give a general description of it, as the alterations will thereby 

 be rendered more intelligible. 



Shell of five obliquely striated, almost smooth, tumid, por- 

 cellanous volutions, separated by a fine sutural line, variously 

 painted with all imaginable hues of colours, forming in many 

 specimens a splendid tout ensemble : the body whorl equals in 

 size all the rest. The aperture is suboval, outer lip sharp, 

 and much advanced beyond the columellar side. 



Animal. The mantle exactly lines the shell, and is of the 

 palest hyaline sea-green. Muzzle very short, cylindrical, 

 finely wrinkled, mottled with red-brown blotches, sometimes 

 marked with transverse green stripes, and at others with longi- 

 tudinal streaks of the same colour, on a yellow or pale red 

 ground ; its termination or disk is subcircular, finely serrated 

 at the margin, and has a crosial oral fissure ; from this the 

 animal often protrudes the corneous jaws, which with the 

 lingual riband are supported by greenish fleshy plates ; the 

 under surface of the disk is marked with red streaks on a 

 white ground. The tentacula are pale yellowish- white, long, 

 pointed, flattish, crowded with fine setse, and are in constant 

 vibration. The eyes are external, on distinct yellow, white, 

 or green pedicles. The neck-lappets are white, pale, or grass- 

 green subcircular membranes ; the right is the largest, mar- 

 gined with 12-15 distinct white or green cirrhi, of almost 

 equal length, and fimbriated at the sides; the left has only 



